Coriolis-type mass flowmeter having a straight measuring tube

Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...

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G01F 184

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active

049727249

ABSTRACT:
A flowmeter of the Coriolis type in which the fluid to be metered is conducted through a straight measuring tube attached at its inlet and outlet ends to fixed supports, whereby the tube is free to vibrate in a circular path as well as to torsionally oscillate. Actuator means are provided to excite the tube at a point intermediate the inlet and outlet ends, causing the tube to vibrate in a circular path. When fluid flows therethrough, the tube is subjected to Coriolis forces, causing it to torsionally oscillate in accordance with mass flow. A pair of sensors are disposed at respective points between the inlet and outlet ends of the tube and the excitation point to yield in response to the torsional oscillations, sensor signals which are applied to a processing circuit from which a measurement signal is derived that depends on the relative phases of the sensor signals, after averaging several circular vibrations to provide a mass flow readout.

REFERENCES:
patent: 3329019 (1967-07-01), Sipin
patent: 4622858 (1986-11-01), Mizerak
patent: 4879910 (1989-11-01), Lew

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